Fix doc comments when multi-line annotations are used to avoid commen…

…ts containing annotation values

src/bindgen/ir/documentation.rs

@@ -15,10 +15,37 @@ pub struct Documentation {
 
 impl Documentation {
     pub fn load(attrs: &[syn::Attribute]) -> Self {
+        let attrs_lines = attrs.get_comment_lines();
+        let annotation_lines: Vec<usize> = attrs_lines
+            .iter()
+            .enumerate()
+            .filter_map(|(i, line)| {
+                let line = line.trim_start();
+                if !line.starts_with("cbindgen:") {
+                    return None;
+                }
+
+                Some(i)
+            })
+            .collect();
+
+        let mut skip_lines = annotation_lines.clone();
+
+        annotation_lines.iter().for_each(|line_index| {
+            for i in *line_index..attrs_lines.len() - 1 {
+                if !attrs_lines[i].ends_with('\\') {
+                    break;
+                }
+                skip_lines.push(i);
+            }
+        });
+
         let doc = attrs
             .get_comment_lines()
             .into_iter()
-            .filter(|x| !x.trim_start().starts_with("cbindgen:"))
+            .enumerate()
+            .filter(|(i, _)| !skip_lines.contains(i))
+            .map(|(_, l)| l)
             .collect();
 
         Documentation { doc_comment: doc }